Mouthpiece type toothbrush and the operating method thereof

ABSTRACT

A mouthpiece type toothbrush comprises: a maxillary body part; a maxillary groove part formed at the maxillary body part to accommodate upper teeth; a maxillary outer rotation shaft configured with a plurality of straight shafts along an outside inner wall of the maxillary groove part; a maxillary inner rotation shaft configured with a plurality of straight shafts along an inside inner wall of the maxillary groove part; a maxillary third gear formed on any one straight shaft among the plurality of straight shafts configuring the maxillary outer rotation shaft; a shaft part having a screw thread; and a maxillary one-way bearing configured to rotate in one direction by a movement of the screw thread of the shaft part. The maxillary third gear rotates together with the rotation of the maxillary one-way bearing.

BACKGROUND

1. Technical Field

The present invention relates to a mouthpiece type toothbrush and the operating method thereof, and more particularly, to a mouthpiece type toothbrush enabling teeth to be naturally brushed by inserting the teeth into the mouthpiece type toothbrush and performing a jaw motion.

2. Description of the Related Art

A toothbrush is a tool used for maintaining dental hygiene and is one of the oldest inventions of the humanity. The toothbrush is generally formed of a bar-shaped body and toothbrush bristles disposed at an end portion of the body, and a user brushes teeth by gripping the toothbrush with hand and moving the toothbrush up and down or back and forth along the teeth in the mouth.

However, brushing teeth using the conventional toothbrush is an extremely difficult activity for the disabled who face difficulty in moving legs and arms. Particularly, a disabled person who cannot use both hands or arms experiences even more difficulty when there is no one besides to help each time during brushing teeth.

To remove this difficulty, an electric toothbrush is used to help a patient brush teeth in some clinics.

However, even when an electric toothbrush is used, a helping person is needed for a patient who cannot freely use both hands.

In addition, in the cases of most electric toothbrushes, toothbrush bristles are formed in a circular shape, and the circular toothbrush bristles rotate in one direction, causing a concern for injuring gums, thus a problem arises of a difficulty to correctly brush the teeth.

SUMMARY

The present invention has been devised to solve the above problem and is directed to providing a mouthpiece type toothbrush and the operating method thereof enabling even the mobility-impaired to brush teeth on one's own. Particularly, the present invention is directed to providing a mouthpiece type toothbrush and the operating method thereof enabling even a disabled person who faces a difficulty in using both hands to brush teeth.

In addition, the present invention is directed to providing a mouthpiece type toothbrush and the operating method thereof in which toothbrush bristles rotate in the direction that will not injure gums.

In addition, the present invention is directed to providing a mouthpiece type toothbrush and the operating method thereof in which the mouthpiece type toothbrush operates only by a user's jaw motion without a separate power source.

To achieve the above objectives, there is provided a mouthpiece type toothbrush including a maxillary body part, a mandibular body part, a maxillary groove part formed at the maxillary body part to accommodate upper teeth, a mandibular groove part formed at the mandibular body part to accommodate lower teeth, a maxillary opening part formed at the maxillary body part, a mandibular opening part formed at the mandibular body part, a shaft part having a screw thread connected to the maxillary body part and the mandibular body part through the maxillary opening part and the mandibular opening part, a maxillary one-way bearing disposed at a side of the maxillary body part to vertically move along the shaft part, a mandibular one-way bearing disposed at a side of the mandibular body part to vertically move along the shaft part, a maxillary outer first rotation shaft having one end connected to the maxillary one-way bearing to rotate together with the rotation of the maxillary one-way bearing, a maxillary outer second rotation shaft having one end connected to the maxillary one-way bearing to rotate together with the rotation of the maxillary one-way bearing, a mandibular outer first rotation shaft having one end connected to the mandibular one-way bearing to rotate together with the rotation of the mandibular one-way bearing, and a mandibular outer second rotation shaft having one end connected to the mandibular one-way bearing to rotate together with the rotation of the mandibular one-way bearing, wherein toothbrush bristles are disposed at the maxillary outer first rotation shaft, the maxillary outer second rotation shaft, the mandibular outer first rotation shaft, and the mandibular outer second rotation shaft.

In addition, there is provided a mouthpiece type toothbrush further including a maxillary outer first rotary gear connected to the other end of the maxillary outer first rotation shaft, a maxillary outer second rotary gear connected to the other end of the maxillary outer second rotation shaft, a maxillary inner first rotary gear to rotate by interlocking with the maxillary outer first rotary gear, a maxillary inner second rotary gear to rotate by interlocking with the maxillary outer second rotary gear, a maxillary inner first rotation shaft having one end connected to the maxillary inner first rotary gear and the other end connected to a fixed part, a maxillary inner second rotation shaft having one end connected to the maxillary inner second rotary gear and the other end connected to the fixed part, a mandibular outer first rotary gear connected to the other end of the mandibular outer first rotation shaft, a mandibular outer second rotary gear connected to the other end of the mandibular outer second rotation shaft, a mandibular inner first rotary gear to rotate by interlocking with the mandibular outer first rotary gear, a mandibular inner second rotary gear to rotate by interlocking with the mandibular outer second rotary gear, a mandibular inner first rotation shaft having one end connected to the mandibular inner first rotary gear and the other end connected to the fixed part, and a mandibular inner second rotation shaft having one end connected to the mandibular inner second rotary gear and the other end connected to the fixed part, wherein toothbrush bristles are disposed at the maxillary inner first rotation shaft, the maxillary inner second rotation shaft, the mandibular inner first rotation shaft, and the mandibular inner second rotation shaft.

In addition, there is provided a mouthpiece type toothbrush further including a fixed shaft to rotatably connect the maxillary body part and the mandibular body part, and an elastic member disposed between the maxillary body part and the mandibular body part to form a gap between the maxillary body part and the mandibular body part.

In addition, there is provided a mouthpiece type toothbrush wherein the maxillary one-way bearing rotates only when being lowered along the shaft part.

In addition, there is provided a mouthpiece type toothbrush wherein the maxillary outer first rotation shaft and the maxillary outer second rotation shaft rotate in the direction of brushing upper teeth from top to bottom by the rotation of the maxillary one-way bearing.

In addition, there is provided a mouthpiece type toothbrush wherein the maxillary one-way bearing rotates only when being lowered along the shaft part.

In addition, there is provided a mouthpiece type toothbrush wherein the maxillary outer first rotation shaft and the maxillary outer second rotation shaft rotate in the direction of brushing upper teeth from top to bottom by the rotation of the maxillary one-way bearing, and the maxillary inner first rotation shaft and the maxillary inner second rotation shaft rotate in the direction of brushing upper teeth from top to bottom by the rotations of the maxillary outer first rotation shaft and the maxillary outer second rotation shaft.

In addition, there is provided a mouthpiece type toothbrush wherein the mandibular one-way bearing rotates only when being lifted along the shaft part.

In addition, there is provided a mouthpiece type toothbrush wherein the mandibular outer first rotation shaft and the mandibular outer second rotation shaft rotate in the direction of brushing lower teeth from bottom to top by the rotation of the mandibular one-way bearing.

In addition, there is provided a mouthpiece type toothbrush wherein the mandibular one-way bearing rotates only when being lifted along the shaft part.

In addition, there is provided a mouthpiece type toothbrush wherein the mandibular outer first rotation shaft and the mandibular outer second rotation shaft rotate in the direction of brushing lower teeth from bottom to top by the rotation of the mandibular one-way bearing, and the mandibular inner first rotation shaft and the mandibular inner second rotation shaft rotate in the direction of brushing lower teeth from bottom to top by the rotations of the mandibular outer first rotation shaft and the mandibular outer second rotation shaft.

In addition, there is provided a mouthpiece type toothbrush wherein a liquid toothpaste tube is disposed inside the maxillary outer first rotation shaft, the maxillary outer second rotation shaft, the maxillary inner first rotation shaft, the maxillary inner second rotation shaft, the mandibular outer first rotation shaft, the mandibular outer second rotation shaft, the mandibular inner first rotation shaft, and the mandibular inner second rotation shaft, and the toothpaste in the liquid toothpaste tube is dispensed through a plurality of holes disposed at the maxillary outer first rotation shaft, the maxillary outer second rotation shaft, the maxillary inner first rotation shaft, the maxillary inner second rotation shaft, the mandibular outer first rotation shaft, the mandibular outer second rotation shaft, the mandibular inner first rotation shaft, and the mandibular inner second rotation shaft by the rotations of the maxillary outer first rotation shaft, the maxillary outer second rotation shaft, the maxillary inner first rotation shaft, the maxillary inner second rotation shaft, the mandibular outer first rotation shaft, the mandibular outer second rotation shaft, the mandibular inner first rotation shaft, and the mandibular inner second rotation shaft.

In addition, there is provided an operating method of a mouthpiece type toothbrush, the operating method including moving a maxillary body part and a mandibular body part in the direction of touching each other, rotating and moving a maxillary one-way bearing disposed at the maxillary body part and a mandibular one-way bearing disposed at the mandibular body part in the direction of becoming closer to each other along a shaft part, rotating a maxillary outer first rotation shaft and a maxillary outer second rotation shaft in the direction of brushing upper teeth from top to bottom by the rotation of the maxillary one-way bearing, and rotating a mandibular outer first rotation shaft and a mandibular outer second rotation shaft in the direction of brushing lower teeth from bottom to top by the rotation of the mandibular one-way bearing.

In addition, there is provided an operating method of a mouthpiece type toothbrush, the operating method further including, after the rotating of the maxillary outer first rotation shaft and the maxillary outer second rotation shaft in the direction of brushing upper teeth from top to bottom by the rotation of the maxillary one-way bearing, rotating a maxillary inner first rotation shaft in the direction of brushing upper teeth from top to bottom by the rotation of the maxillary outer first rotation shaft, and rotating a maxillary inner second rotation shaft in the direction of brushing upper teeth from top to bottom by the rotation of the maxillary outer second rotation shaft.

In addition, there is provided an operating method of a mouthpiece type toothbrush, the operating method further including, after the rotating of the mandibular outer first rotation shaft and the mandibular outer second rotation shaft in the direction of brushing lower teeth from bottom to top by the rotation of the mandibular one-way bearing, rotating a mandibular inner first rotation shaft in the direction of brushing lower teeth from bottom to top by the rotation of the mandibular outer first rotation shaft, and rotating a mandibular inner second rotation shaft in the direction of brushing lower teeth from bottom to top by the rotation of the mandibular outer second rotation shaft.

In addition, there is provided an operating method of a mouthpiece type toothbrush, the operating method further including, after the rotating of the mandibular outer first rotation shaft and the mandibular outer second rotation shaft in the direction of brushing lower teeth from bottom to top by the rotation of the mandibular one-way bearing, spacing the maxillary body part and the mandibular body part apart in the direction of becoming farther from each other, and moving, while not rotating, the maxillary one-way bearing disposed at the maxillary body part and the mandibular one-way bearing disposed at the mandibular body part in the direction of becoming farther from each other along the shaft part.

In addition, there is provided a mouthpiece type toothbrush including a maxillary body part, a maxillary groove part formed at the maxillary body part to accommodate upper teeth, a maxillary outer rotation shaft configured with a plurality of straight shafts along an outside inner wall of the maxillary groove part, a maxillary inner rotation shaft configured with a plurality of straight shafts along an inside inner wall of the maxillary groove part, a maxillary third gear formed on any one straight shaft among the plurality of straight shafts configuring the maxillary outer rotation shaft, a shaft part having a screw thread, and a maxillary one-way bearing to rotate in one direction by a movement of the screw thread of the shaft part, wherein the maxillary third gear rotates together with the rotation of the maxillary one-way bearing.

In addition, there is provided a mouthpiece type toothbrush further including a belt member to connect the maxillary outer rotation shaft and the maxillary inner rotation shaft, wherein the plurality of straight shafts configuring the maxillary outer rotation shaft are connected via an axial gear on which a screw gear is formed, and the plurality of straight shafts configuring the maxillary inner rotation shaft are connected via an axial gear on which a screw gear is formed.

In addition, there is provided a mouthpiece type toothbrush further including a maxillary first gear and a maxillary second gear, wherein the rotation of the maxillary third gear together with the rotation of the maxillary one-way bearing is performed by the maxillary first gear rotating by the rotation of the maxillary one-way bearing, the maxillary second gear rotating by the rotation of the maxillary first gear, and the maxillary third gear rotating by the rotation of the maxillary second gear.

In addition, there is provided a mouthpiece type toothbrush further including a mandibular body part, a mandibular groove part formed at the mandibular body part to accommodate lower teeth, a mandibular outer rotation shaft configured with a plurality of straight shafts along an outside inner wall of the mandibular groove part, a mandibular inner rotation shaft configured with a plurality of straight shafts along an inside inner wall of the mandibular groove part, a mandibular third gear formed on any one straight shaft among the plurality of straight shafts configuring the mandibular outer rotation shaft, a shaft part having a screw thread, a mandibular one-way bearing to rotate in one direction by a movement of the screw thread of the shaft part, a belt member to connect the mandibular outer rotation shaft and the mandibular inner rotation shaft, a mandibular first gear, and a mandibular second gear wherein the mandibular third gear rotates together with the rotation of the mandibular one-way bearing, the plurality of straight shafts configuring the mandibular outer rotation shaft are connected via an axial gear on which a screw gear is formed, the plurality of straight shafts configuring the mandibular inner rotation shaft are connected via an axial gear on which a screw gear is formed, and the rotation of the mandibular third gear together the rotation of the mandibular one-way bearing is performed by the mandibular first gear rotating by the rotation of the mandibular one-way bearing, the mandibular second gear rotating by the rotation of the mandibular first gear, and the mandibular third gear rotating by the rotation of the mandibular second gear.

BRIEF DESCRIPTION OF DRAWINGS

The above and other objects, features and advantages of the present invention will become more apparent to those of ordinary skill in the art by describing in detail exemplary embodiments thereof with reference to the accompanying drawings, in which:

FIG. 1 is a view illustrating an appearance of a mouthpiece type toothbrush according to a preferred embodiment of the present invention;

FIG. 2 is a view illustrating toothbrush bristles formed at each rotation shaft in the mouthpiece type toothbrush according to the preferred embodiment of the present invention;

FIG. 3 is a view illustrating a state in which upper teeth are inserted into the mouthpiece type toothbrush according to the preferred embodiment of the present invention;

FIG. 4 is a view illustrating a state in which upper teeth are inserted into the mouthpiece type toothbrush according to the preferred embodiment of the present invention having toothbrush bristles formed;

FIG. 5 is a view illustrating an operational process of a shaft part and a one-way bearing moving along the shaft part in the mouthpiece type toothbrush according to the preferred embodiment of the present invention;

FIG. 6 is a view illustrating an inner configuration of a maxillary one-way bearing or a mandibular one-way bearing used in the mouthpiece type toothbrush according to the preferred embodiment of the present invention;

FIG. 7 is a view illustrating a cross-sectional view of a portion near the shaft part of the mouthpiece type toothbrush according to the preferred embodiment of the present invention;

FIG. 8 is a view illustrating toothbrush bristles of the mouthpiece type toothbrush according to the preferred embodiment of the present invention brushing teeth by rotating around teeth;

FIG. 9 is a view illustrating an appearance of a rotation shaft and an appearance of a toothpaste tube disposed within the rotation shaft of the mouthpiece type toothbrush according to the preferred embodiment of the present invention;

FIG. 10 is a view illustrating an appearance of a mouthpiece type toothbrush according to another embodiment of the present invention; and

FIG. 11 is a view illustrating an enlarged view of a portion near a shaft part of the mouthpiece type toothbrush according to another embodiment of the present invention.

DETAILED DESCRIPTION OF EMBODIMENTS

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Since the present invention may be modified in various ways and have several embodiments, particular embodiments of the present invention will be exemplified and described in detail below. However, the present invention is not limited by the disclosed particular embodiments and it should be construed that the present invention includes all modifications, equivalents or substitutes belonging to the spirit and the technical scope of the present invention.

FIG. 1 is a view illustrating an appearance of a mouthpiece type toothbrush according to a preferred embodiment of the present invention.

The mouthpiece type toothbrush according to the preferred embodiment of the present invention is mainly formed of a maxillary body part 100 in charge of an upper jaw and a mandibular body part 200 in charge of a lower jaw.

A maxillary groove part 110 capable of accommodating upper teeth may be formed at the maxillary body part 100, and a mandibular groove part 210 capable of accommodating lower teeth may be formed at the mandibular body part 200. Also, a maxillary opening part 120 and a mandibular opening part 220 may be formed at the maxillary body part 100 and the mandibular body part 200, respectively, for a shaft part 500 that connects the maxillary body part 100 and the mandibular body part 200 to pass therethrough.

A maxillary outer first rotation shaft 410 and a maxillary outer second rotation shaft 420 each having one end rotating by interlocking with the shaft part 500 may be disposed within the maxillary groove part 110 of the maxillary body part 100 of the mouthpiece type toothbrush according to the preferred embodiment of the present invention. Specifically, a maxillary one-way bearing 310 and a mandibular one-way bearing 320 may be coupled to the shaft part 500 to rotate in one direction while vertically moving, and each of the rotation shafts disposed at the maxillary body part 100 and the mandibular body part 200 may be rotated as gears interlocking with the maxillary one-way bearing 310 and the mandibular one-way bearing 320 rotate by the rotations of the maxillary one-way bearing 310 and the mandibular one-way bearing 320. The operating method will be examined in more detail below with reference to the drawings.

A maxillary outer first rotary gear 810 may be formed at the other end of the maxillary outer first rotation shaft 410 of the mouthpiece type toothbrush according to the preferred embodiment of the present invention, and the maxillary outer first rotary gear 810 may rotate together with a maxillary inner first rotary gear 830 by interlocking. Also, the maxillary inner first rotary gear 830 may be formed at one end of a maxillary inner first rotation shaft 430. Consequently, the maxillary inner first rotation shaft 430 may rotate together with the rotation of the maxillary outer first rotation shaft 410.

Likewise, one end of the maxillary outer second rotation shaft 420 may also rotate together with the shaft part by interlocking with the shaft part. Also, a maxillary outer second rotary gear 820 may be formed at the other end of the maxillary outer second rotation shaft 420, and a maxillary inner second rotation shaft 440 may rotate together with the maxillary outer second rotation shaft 420 due to the maxillary inner second rotary gear formed at one end of the maxillary inner second rotation shaft 440.

A mandibular outer first rotation shaft 450, a mandibular outer second rotation shaft, a mandibular inner first rotation shaft 460, and a mandibular inner second rotation shaft may also rotate by a method similar to that of rotating the rotation shafts of the maxillary body part 100.

The maxillary portion and the mandibular portion of the mouthpiece type toothbrush according to the preferred embodiment of the present invention may be formed to be symmetrical to each other. That is, even when any one part of the maxillary portion and the mandibular portion is not illustrated in detail in the description of the present invention, the operating method thereof may be ascertained from the description of the symmetrically corresponding mandibular portion or the maxillary portion. In other words, even when a systematic operational relation between the shaft part 500 and the mandibular one-way bearing 320 is not illustrated in detail in the mandibular portion, those of ordinary skill in the art can easily predict from an operational process of the shaft part 500 and the maxillary one-way bearing 310 in the maxillary portion that the corresponding parts of the mandibular portion may operate in a similar way.

Consequently, even when only the maxillary outer first rotation shaft 410, the maxillary outer second rotation shaft 420, the maxillary inner first rotation shaft 430, and the maxillary inner second rotation shaft 440 of the maxillary body part 100 are illustrated in FIG. 1 and any one part among the mandibular outer first rotation shaft 450, the mandibular outer second rotation shaft, the mandibular inner first rotation shaft 460, and the mandibular inner second rotation shaft of the mandibular body part 200 is not illustrated, it is evident that an operational process of the rotation shafts disposed in the mandibular body part 200 may be easily predicted from the operational process of the rotation shafts of the maxillary body part 100.

In the mouthpiece type toothbrush according to the preferred embodiment of the present invention, the maxillary body part 100 and the mandibular body part 200 may be rotatably connected via a fixed shaft 610.

In addition, an elastic member (not shown) such as a spring capable of performing a role of forming a gap may be disposed between the maxillary body part 100 and the mandibular body part 200. Also, the elastic member may be inserted into the fixed shaft 610 to be integrally manufactured with the fixed shaft 610, but the embodiments are not limited thereto.

The maxillary body part 100 and the mandibular body part 200 of the mouthpiece type toothbrush according to the preferred embodiment of the present invention may be spaced apart from each other by an elastic force of the elastic member normally. In other words, the maxillary body part 100 and the mandibular body part 200 may be spread to form a shape in which a mouth is opened.

In addition, the maxillary body part 100 and the mandibular body part 200 may come in contact with each other by a user inserting teeth into the mouthpiece type toothbrush in the shape of an opened mouth and applying force.

In this process, the maxillary one-way bearing 310 and the mandibular one-way bearing 320 may rotate while moving along the shaft part 500. That is, gears interlocking with the maxillary outer first rotation shaft 410, the maxillary outer second rotation shaft 420, the mandibular outer first rotation shaft 450, and the mandibular outer second rotation shaft may be rotated by the rotations of the maxillary one-way bearing 310 and the mandibular one-way bearing 320.

Consequently, when the user closes the mouth after inserting the teeth into the mouthpiece type toothbrush according to the preferred embodiment of the present invention, the rotation shafts disposed at the maxillary body part 100 and the mandibular body part 200 may brush the teeth by rotating. In more detail, the rotation shafts disposed at the maxillary body part 100 may rotate in the direction of brushing the upper teeth from top to bottom, and the rotation shafts disposed at the mandibular body part 200 may rotate in the direction of brushing the lower teeth from bottom to top.

Next, when the user releases the force applied to the upper jaw and the lower jaw, the maxillary body part 100 and the mandibular body part 200 of the mouthpiece type toothbrush according to the preferred embodiment of the present invention may be spread again by the restoring force of the elastic member.

In this step, the maxillary one-way bearing 310 and the mandibular one-way bearing 320 of the mouthpiece type toothbrush according to the preferred embodiment of the present invention may not rotate while moving along the shaft part 500. That is, the maxillary one-way bearing 310 rotates when moving from top to bottom along the shaft part 500 but may not rotate when moving from bottom to top. Also, the mandibular one-way bearing 320 rotates when moving from bottom to top along the shaft part 500 but may not rotate when moving from top to bottom.

This is because gums may be injured due to reverse rotations of the rotation shafts disposed at the maxillary body part 100 and the rotation shafts disposed at the mandibular body part 200 when the maxillary one-way bearing 310 and the mandibular one-way bearing 320 rotate in reverse while the maxillary body part 100 and the mandibular body part 200 are separating. In other words, this is to prevent gums from being injured due to the rotation shafts disposed at the maxillary body part 100 rotating in the direction of brushing the upper teeth from bottom to top or the rotation shafts disposed at the mandibular body part 200 rotating in the direction of brushing the lower teeth from top to bottom.

Consequently, a user using the mouthpiece type toothbrush according to the preferred embodiment of the present invention may not only brush teeth by simply inserting the teeth into the mouthpiece type toothbrush and performing a jaw motion but also may prevent gums from being injured due to a reverse rotation of the toothbrush bristles.

The rotation method of each of the rotation shafts of the maxillary body part 100 and the mandibular body part 200 according to the preferred embodiment of the present invention will be examined in more detail below.

FIG. 2 is a view illustrating toothbrush bristles formed at each rotation shaft in the mouthpiece type toothbrush according to the preferred embodiment of the present invention.

Toothbrush bristles may be formed at the maxillary outer first rotation shaft 410, the maxillary outer second rotation shaft 420, the maxillary inner first rotation shaft 430, and the maxillary inner second rotation shaft 440 of the mouthpiece type toothbrush according to the preferred embodiment of the present invention. The toothbrush bristles may be directly formed on each of the rotation shafts, but a separate member on which the toothbrush bristles are formed may also be attached to a rotation shaft.

In addition, the maxillary outer first rotation shaft 410, the maxillary outer second rotation shaft 420, the maxillary inner first rotation shaft 430, and the maxillary inner second rotation shaft 440 may rotate in the direction in which the toothbrush bristles brush the teeth downward from the gums to the teeth.

In addition, although not illustrated in the drawings, the mandibular outer first rotation shaft 450, the mandibular outer second rotation shaft, the mandibular inner first rotation shaft 460, and the mandibular inner second rotation shaft of the mandibular body part 200 may also rotate by the same method. However, the mandibular outer first rotation shaft, the mandibular outer second rotation shaft, the mandibular inner first rotation shaft, and the mandibular inner second rotation shaft of the mandibular body part 200 may rotate in the direction of brushing the lower teeth from bottom to top.

Consequently, according to the mouthpiece type toothbrush according to the preferred embodiment of the present invention, teeth may be brushed while minimizing injuries of gums due to the brushing of the teeth.

In addition, toothpaste is dispensed from the rotation shafts of the mouthpiece type toothbrush according to the preferred embodiment of the present invention by the rotations of the rotation shafts such that the toothpaste may be put on toothbrush bristles 700.

Consequently, a user of the mouthpiece type toothbrush according to the preferred embodiment of the present invention may brush teeth by simply inserting the teeth into the mouthpiece type toothbrush according to the preferred embodiment of the present invention and performing a jaw motion without requiring separate toothpaste. Consequently, even people who face difficulty in using both hands or both arms may brush teeth on their own without help from others so long as they can perform the jaw motion.

A principle of the toothpaste being dispensed to the toothbrush bristles 700 will be described in more detail below with reference to the drawings.

FIGS. 3 and 4 are views illustrating states in which the upper teeth are inserted into the mouthpiece type toothbrush according to the preferred embodiment of the present invention.

The user's teeth may be inserted into the maxillary groove part 110 of the maxillary body part 100. Also, the maxillary outer first rotation shaft 410 and the maxillary outer second rotation shaft 420 may be positioned at front portions of the upper teeth, and the maxillary inner first rotation shaft 430 and the maxillary inner second rotation shaft 440 may be positioned above the upper teeth.

In addition, the user's teeth may be brushed by the rotation of each of the rotation shafts. That is, although omitted in FIGS. 3 and 4, the maxillary outer first rotation shaft 410 and the maxillary outer second rotation shaft 420 rotate by interlocking with the maxillary one-way bearing 310 moving along the shaft part 500 and rotating in one direction. Also, at rear portions of the user's molars, the maxillary outer first rotary gear 810 may interlock with the maxillary inner first rotary gear 830, and the maxillary outer second rotary gear 820 may interlock with a maxillary inner second rotary gear 840.

Consequently, the maxillary inner first rotation shaft 430 and the maxillary inner second rotation shaft 440 rotate together with the rotations of the maxillary outer first rotation shaft 410 and the maxillary outer second rotation shaft 420.

The rotation shafts disposed in the mandibular body part 200 may be similarly structured.

Consequently, the mouthpiece type toothbrush according to the preferred embodiment of the present invention can achieve an effect of brushing teeth just by a natural jaw motion of the user without a separate power source such as a motor.

In addition, since the user can brush teeth while controlling a gripping strength and a speed of the jaw motion instead of brushing teeth with a uniform strength as a conventional electric rotary toothbrush does, the brushing of the teeth may be prevented from being hard on the teeth.

FIG. 5 is a view illustrating an operational process of a shaft part and a one-way bearing moving along the shaft part in the mouthpiece type toothbrush according to the preferred embodiment of the present invention.

The shaft part 500 may be disposed between the maxillary body part 100 and the mandibular body part 200 of the mouthpiece type toothbrush according to the preferred embodiment of the present invention. The shaft part 500 may connect the maxillary body part 100 and the mandibular body part 200 via the maxillary groove part 110 and the mandibular groove part 210 formed at the maxillary body part 100 and the mandibular body part 200, respectively.

The maxillary body part 100 and the mandibular body part 200 may symmetrically move back and forth with respect to the shaft part 500, and the one-way bearings mounted on each of the body parts may move together with the movements of the maxillary body part 100 and the mandibular body part 200. Of the one-way bearings, the one-way bearing mounted on the maxillary body part 100 may be referred to as the maxillary one-way bearing 310, and the one-way bearing mounted on the mandibular body part 200 may be referred to as the mandibular one-way bearing 320.

A screw thread may be formed on the shaft part 500 of the mouthpiece type toothbrush according to the preferred embodiment of the present invention. Also, the maxillary one-way bearing 310 and the mandibular one-way bearing 320 may move along the shaft part 500 on which the screw thread is formed.

Particularly, the maxillary one-way bearing 310 may rotate only when moving from top to bottom along the shaft part 500 and not rotate when moving from bottom to top, and the mandibular one-way bearing 320 may also rotate only when moving from bottom to top along the shaft part 500 and not rotate when moving from top to bottom.

Since the maxillary one-way bearing 310 and the mandibular one-way bearing 320 always move in one direction, the toothbrush bristles always move in one direction and do not rotate in reverse, thereby preventing gums from being injured.

A toothed gear may be formed around the maxillary one-way bearing 310. Also, a first driving gear 411 may be formed at one end of the maxillary outer first rotation shaft 410 to enable the maxillary outer first rotation shaft 410 to rotate by interlocking with the maxillary one-way bearing 310. Also, a second driving gear 412 may be formed at one end of the maxillary outer second rotation shaft 420 to enable the maxillary outer second rotation shaft 420 to rotate by interlocking with the maxillary one-way bearing 310.

A toothed gear may be formed at the first driving gear 411 such that the maxillary outer first rotation shaft 410 receives the rotary force of the maxillary one-way bearing 310 and rotates in the direction of brushing the upper teeth from top to bottom.

In addition, a toothed gear may also be formed at the second driving gear 412 such that the maxillary outer second rotation shaft 420 receives the rotary force of the maxillary one-way bearing 310 and rotates in the direction of brushing the lower teeth from bottom to top.

Consequently, in the mouthpiece type toothbrush according to the preferred embodiment of the present invention, the maxillary outer first rotation shaft 410 and the maxillary outer second rotation shaft 420 may rotate in the direction of brushing the teeth from top to bottom when the maxillary one-way bearing 310 moves downward while rotating, and the maxillary outer first rotation shaft 410 and the maxillary outer second rotation shaft 420 may stop and not rotate when the maxillary one-way bearing 310 moves from bottom to top.

The mandibular one-way bearing 320 disposed at the mandibular body part 200 may also operate in a similar way. However, the operation may be symmetrically opposite from the above. That is, the mandibular one-way bearing 320 may rotate only when being lifted from bottom to top along the shaft part 500. Also, the mandibular outer first rotation shaft 450 and the mandibular outer second rotation shaft may rotate in the direction of brushing the lower teeth from bottom to top together with the rotation of the mandibular one-way bearing 320. Also, the mandibular one-way bearing 320 need not rotate when being lowered from top to bottom along the shaft part 500. Consequently, the mandibular outer first rotation shaft 450 and the mandibular outer second rotation shaft may rotate only when the mandibular one-way bearing 320 is lifted upward and not rotate when the mandibular one-way bearing 320 is lowered.

FIG. 6 is a view illustrating an inner configuration of a maxillary one-way bearing or a mandibular one-way bearing used in the mouthpiece type toothbrush according to the preferred embodiment of the present invention.

A one-way bearing used in the mouthpiece type toothbrush according to the preferred embodiment of the present invention may refer to a bearing which transmits rotation in any one direction to the outside but does not transmit rotation in the opposite direction to the outside.

Sloped groove parts are disposed inside the maxillary one-way bearing 310 or the mandibular one-way bearing 320, and due to the slope, a wide space may be formed at any one portion, and a narrow space may be formed at another portion inside the maxillary one-way bearing 310 or the mandibular one-way bearing 320. Also, bearing balls 311 may be disposed therein.

Consequently, when the bearing balls 311 rotate together with the rotation of an inner shaft of the one-way bearing and the bearing balls 311 are stuck in the narrow space inside the one-way bearing due to the rotation of the bearing balls 311, an outer shaft of the one-way bearing also rotates, and the rotary force inside the one-way bearing may be transmitted to the outside.

On the other hand, when the inner shaft of the one-way bearing rotates in the opposite direction and the bearing balls 311 are positioned in the wide space, the rotary force inside the one-way bearing cannot be transmitted to the outside since only the inner shaft of the one-way bearing rotates and the outer shaft thereof does not rotate.

Therefore, in the mouthpiece type toothbrush according to the preferred embodiment of the present invention, the one-way bearing is utilized to perform brushing of teeth in preferred directions, i.e. to brush the upper teeth from top to bottom and brush the lower teeth from bottom to top, thereby preventing gums from being injured.

FIG. 7 is a view illustrating a cross-sectional view of a portion near the shaft part of the mouthpiece type toothbrush according to the preferred embodiment of the present invention.

The shaft part 500 may be disposed between the maxillary body part 100 and the mandibular body part 200 through the maxillary opening part 120 formed at the maxillary body part 100 and the mandibular opening part 220 formed at the mandibular body part 200.

In addition, the rotation shafts having driving gears formed at one ends thereof may be disposed around the shaft part 500. Specifically, the maxillary outer first rotation shaft 410 may be disposed in front of an upper tooth T1 accommodated in the maxillary groove part 110 of the maxillary body part 100, and the maxillary inner first rotation shaft 430 may be disposed behind the upper tooth T1.

A lower tooth T2 may be disposed in the mandibular groove part 210 of the mandibular body part 200, the mandibular outer first rotation shaft 450 may be disposed in front of the lower tooth, and the mandibular inner first rotation shaft 460 may be disposed behind the lower tooth T2.

Consequently, the user of the mouthpiece type toothbrush according to the preferred embodiment of the present invention may brush teeth just by inserting the teeth into the mouthpiece type toothbrush and performing a jaw motion of moving the upper jaw and the lower jaw.

FIG. 8 is a view illustrating the toothbrush bristles of the mouthpiece type toothbrush according to the preferred embodiment of the present invention brushing teeth by rotating around the teeth.

Each of the rotation shafts of the mouthpiece type toothbrush according to the preferred embodiment of the present invention rotates from gums to teeth to not injure the gums. That is, the rotation shafts that brush the upper tooth T1 may brush the tooth while rotating in the direction of brushing the tooth from top to bottom, and the rotation shafts that brush the lower tooth T2 may brush the tooth while rotating in the direction of brushing the tooth from bottom to top.

In addition, positions and the speed at which brushing teeth is performed may be controlled in the mouthpiece type toothbrush according to the preferred embodiment of the present invention since the brushing teeth is performed just by the user controlling the jaw motion without using a separate power. That is, when the user wants to perform brushing of teeth mainly at end portions of the teeth as illustrated in (a) of FIG. 8 due to a large amount of foreign substance being stuck at the end portions of the teeth, the user may repeat a motion of slightly closing the upper jaw and the lower jaw without completely closing the upper jaw and the lower jaw to control the rotation shafts positioned at front and rear portions of the teeth to rotate only at the end portions of the teeth. Also, when the user wants to brush up to ends of the teeth bordering the gums, the user may perform brushing of teeth by completely shutting the upper jaw and the lower jaw.

Consequently, the mouthpiece type toothbrush according to the preferred embodiment of the present invention does not perform brushing of teeth by forcibly rotating in a predetermined speed and direction as a conventional electric toothbrush does but enables a user to brush the teeth by selecting portions of the teeth that require intensive brushing while controlling the speed as needed.

FIG. 9 is a view illustrating an appearance of a rotation shaft and an appearance of a toothpaste tube disposed within the rotation shaft of the mouthpiece type toothbrush according to the preferred embodiment of the present invention.

Each of the rotation shafts disposed at the maxillary body part 100 and the mandibular body part 200 of the mouthpiece type toothbrush according to the preferred embodiment of the present invention may include the toothbrush bristles 700 as seen in (a) of FIG. 9.

In addition, a liquid toothpaste tube 900 may be disposed within the rotation shaft including the toothbrush bristles 700 as seen in (b) of FIG. 9.

The liquid toothpaste tube 900 may have a plurality of holes 901 formed on the surface thereof, and the toothpaste may be dispensed to the outside via the plurality of holes 901. In more detail, the liquid toothpaste tube 900 within the rotation shaft may rotate inside the rotation shaft together with the rotation of the rotation shaft, and the toothpaste inside the liquid toothpaste tube 900 may be discharged to the outside by the rotary force. Also, the discharged toothpaste may flow downward to the toothbrush bristles 700, etc. through a plurality of holes 401.

Consequently, the mouthpiece type toothbrush according to the preferred embodiment of the present invention enables a user to brush teeth just by inserting the teeth into the mouthpiece type toothbrush according to the preferred embodiment of the present invention and performing a jaw motion without separate toothpaste. That is, a person who faces a difficulty in using both hands or arms may have a difficulty even in squeezing toothpaste onto a toothbrush, and since the toothpaste is automatically discharged by the liquid toothpaste tube 900 accommodated in the rotation shafts, brushing of teeth for a disabled person, etc. may be more facilitated.

In addition, although the operation of the liquid toothpaste tube 900 has been described with respect to the maxillary outer first rotation shaft 410, other remaining rotation shafts may also have a similar structure.

FIG. 10 is a view illustrating an appearance of a mouthpiece type toothbrush according to another embodiment of the present invention.

A difference between the mouthpiece type toothbrush according to another embodiment of the present invention and the mouthpiece type toothbrush according to the previous embodiment is that the shaft part 500 and the gears attached to the shaft part 500 are exposed to the outside instead of being disposed at inner portions of the maxillary body part 100 and the mandibular body part 200 that configure the mouthpiece type toothbrush.

In addition, the mouthpiece type toothbrush according to another embodiment of the present invention is different from the mouthpiece type toothbrush according to the previous embodiment in that a plurality of straight shafts 10 of the rotation shafts having the toothbrush bristles are connected via an axial gear 40 and the maxillary outer first rotary gear 810 and the maxillary inner first rotary gear 830 are connected via a belt member 50 instead of being directly connected. The remaining three pairs of rotary gears may also be connected via belt members 50.

In addition, the mouthpiece type toothbrush according to another embodiment of the present invention may further include a maxillary cover 101 and a mandibular cover 201 for fixing the straight shafts 10 accommodated in the maxillary body part 100 and the mandibular body part 200. Also, the maxillary cover 101 and the mandibular cover 201 may be formed with a soft material to enable the mouthpiece type toothbrush according to another embodiment of the present invention to be smoothly mounted inside a user's mouth without causing the user to feel uncomfortable.

Consequently, the mouthpiece type toothbrush according to another embodiment of the present invention has the shaft part 500 and the gears operating by interlocking with the shaft part 500 arranged outside the maxillary body part 100 and the mandibular body part 200, thereby facilitating maintenance and repair of the mouthpiece type toothbrush. Also, since the size of the rotary gears can be reduced, a strangeness felt while wearing the mouthpiece type toothbrush can be reduced.

FIG. 11 is a view illustrating an enlarged view of a portion near a shaft part of the mouthpiece type toothbrush according to another embodiment of the present invention.

Different from in the previous embodiment, the shaft part 500 of the mouthpiece type toothbrush according to another embodiment of the present invention may be attached to outer portions of a body part, and a one-way bearing that moves along the screw thread of the shaft part 500 may be mounted on the shaft part 500. Also although not illustrated, a one-way bearing may also be mounted in the same way at the mandibular body part, and the one-way bearing may operate in the same way as above.

Hereinafter, for convenience of description, an operating method of the mouthpiece type toothbrush according to another embodiment of the present invention will be described with respect to the maxillary body part 100.

The maxillary one-way bearing 310 rotates due to a downward movement of the shaft part 500, a first gear 20 rotates together with the rotation of the maxillary one-way bearing 310, and the second gear 30 interlocking with the first gear 20 also rotates together with the rotation of the first gear 20. A third gear 60 disposed at the straight shafts 10 rotates together with the rotation of the second gear 30 by interlocking with the second gear 30, and the straight shafts 10 rotate together with the rotation of the third gear 60. Consequently, toothbrush bristles (not shown) attached to the straight shafts 10 may rotate together with the straight shafts 10 and perform brushing of teeth. That is, the toothbrush bristles rotate in the direction of brushing the upper teeth from top to bottom, thus brushing teeth without injuring the gums. The mandibular body part 200 may also operate in the same way as above.

As in the previous embodiment, the maxillary one-way bearing 310 stands still instead of rotating when the shaft part 500 moves upward in the mouthpiece type toothbrush according to another embodiment of the present invention. Consequently, the gums may be prevented from being injured due to a reverse rotation of the toothbrush bristles.

A mouthpiece type toothbrush and the operating method thereof according to preferred embodiments of the present invention have the following effects.

First, teeth may be brushed by a simple jaw motion without using hands or a separate power source. Consequently, users who cannot freely use hands or arms or who are disabled can also conveniently brush their teeth on their own without help from others.

Second, since the mouthpiece type toothbrush according to the preferred embodiments of the present invention has toothbrush bristles moving in the direction of brushing downward from gums to teeth or brushing upward from gums to teeth, injury of the gums can be minimized. Particularly, since one-way bearings mounted on a shaft part move only in one direction, gums can be prevented from being injured due to a reverse rotation of the toothbrush bristles.

Third, since the mouthpiece type toothbrush according to the preferred embodiments of the present invention has toothbrush bristles evenly rotating throughout outer and inner portions of upper teeth and lower teeth, the effect of brushing teeth can be maximized.

Fourth, according to the mouthpiece type toothbrush according to the preferred embodiments of the present invention, an upper jaw and a lower jaw of a user are allowed to move in the direction of constantly being occluded with each other, thereby effectively correcting malocclusion of the upper jaw and the lower jaw. Particularly, malocclusion of growing children can be effectively corrected.

Fifth, toothpaste is distributed by the rotations of rotation shafts including toothbrush bristles such that teeth can be brushed by simply inserting the teeth into the mouthpiece type toothbrush and performing a jaw motion, thereby shortening the time for brushing teeth of people nowadays living in hectic routines, even if they are not disabled.

Sixth, the mouthpiece type toothbrush according to the preferred embodiments of the present invention can be smoothly mounted inside a mouth by a maxillary cover and a mandibular cover being additionally configured, thereby improving convenience of use.

In the above, although the present invention has been described with reference to the preferred embodiments of the present invention, those of ordinary skill in the art will understand that the present invention may be modified and changed in various ways within the scope not departing from the spirit and the realm of the present invention described in the claims below. 

What is claimed is:
 1. A mouthpiece type toothbrush comprising: a maxillary body part; a mandibular body part; a maxillary groove part formed at the maxillary body part to accommodate upper teeth; a mandibular groove part formed at the mandibular body part to accommodate lower teeth; a maxillary opening part formed at the maxillary body part; a mandibular opening part formed at the mandibular body part; a shaft part having a screw thread connected to the maxillary body part and the mandibular body part through the maxillary opening part and the mandibular opening part; a maxillary one-way bearing disposed at a side of the maxillary body part to vertically move along the shaft part; a mandibular one-way bearing disposed at a side of the mandibular body part to vertically move along the shaft part; a maxillary outer first rotation shaft having one end connected to the maxillary one-way bearing to rotate together with the rotation of the maxillary one-way bearing; a maxillary outer second rotation shaft having one end connected to the maxillary one-way bearing to rotate together with the rotation of the maxillary one-way bearing; a mandibular outer first rotation shaft having one end connected to the mandibular one-way bearing to rotate together with the rotation of the mandibular one-way bearing; and a mandibular outer second rotation shaft having one end connected to the mandibular one-way bearing to rotate together with the rotation of the mandibular one-way bearing, wherein toothbrush bristles are disposed at the maxillary outer first rotation shaft, the maxillary outer second rotation shaft, the mandibular outer first rotation shaft, and the mandibular outer second rotation shaft.
 2. The mouthpiece type toothbrush according to claim 1, further comprising: a maxillary outer first rotary gear connected to the other end of the maxillary outer first rotation shaft; a maxillary outer second rotary gear connected to the other end of the maxillary outer second rotation shaft; a maxillary inner first rotary gear configured to rotate by interlocking with the maxillary outer first rotary gear; a maxillary inner second rotary gear configured to rotate by interlocking with the maxillary outer second rotary gear; a maxillary inner first rotation shaft having one end connected to the maxillary inner first rotary gear and the other end connected to a fixed part; a maxillary inner second rotation shaft having one end connected to the maxillary inner second rotary gear and the other end connected to the fixed part; a mandibular outer first rotary gear connected to the other end of the mandibular outer first rotation shaft; a mandibular outer second rotary gear connected to the other end of the mandibular outer second rotation shaft; a mandibular inner first rotary gear configured to rotate by interlocking with the mandibular outer first rotary gear; a mandibular inner second rotary gear configured to rotate by interlocking with the mandibular outer second rotary gear; a mandibular inner first rotation shaft having one end connected to the mandibular inner first rotary gear and the other end connected to the fixed part; and a mandibular inner second rotation shaft having one end connected to the mandibular inner second rotary gear and the other end connected to the fixed part, wherein toothbrush bristles are disposed at the maxillary inner first rotation shaft, the maxillary inner second rotation shaft, the mandibular inner first rotation shaft, and the mandibular inner second rotation shaft.
 3. The mouthpiece type toothbrush according to claim 1, further comprising: a fixed shaft configured to rotatably connect the maxillary body part and the mandibular body part; and an elastic member disposed between the maxillary body part and the mandibular body part to form a gap between the maxillary body part and the mandibular body part.
 4. The mouthpiece type toothbrush according to claim 1, wherein the maxillary one-way bearing rotates only when being lowered along the shaft part.
 5. The mouthpiece type toothbrush according to claim 4, wherein the maxillary outer first rotation shaft and the maxillary outer second rotation shaft rotate in the direction of brushing upper teeth from top to bottom by the rotation of the maxillary one-way bearing.
 6. The mouthpiece type toothbrush according to claim 2, wherein the maxillary one-way bearing rotates only when being lowered along the shaft part.
 7. The mouthpiece type toothbrush according to claim 6, wherein: the maxillary outer first rotation shaft and the maxillary outer second rotation shaft rotate in the direction of brushing upper teeth from top to bottom by the rotation of the maxillary one-way bearing; and the maxillary inner first rotation shaft and the maxillary inner second rotation shaft rotate in the direction of brushing upper teeth from top to bottom by the rotations of the maxillary outer first rotation shaft and the maxillary outer second rotation shaft.
 8. The mouthpiece type toothbrush according to claim 1, wherein the mandibular one-way bearing rotates only when being lifted along the shaft part.
 9. The mouthpiece type toothbrush according to claim 8, wherein the mandibular outer first rotation shaft and the mandibular outer second rotation shaft rotate in the direction of brushing lower teeth from bottom to top by the rotation of the mandibular one-way bearing.
 10. The mouthpiece type toothbrush according to claim 2, wherein the mandibular one-way bearing rotates only when being lifted along the shaft part.
 11. The mouthpiece type toothbrush according to claim 10, wherein: the mandibular outer first rotation shaft and the mandibular outer second rotation shaft rotate in the direction of brushing lower teeth from bottom to top by the rotation of the mandibular one-way bearing; and the mandibular inner first rotation shaft and the mandibular inner second rotation shaft rotate in the direction of brushing lower teeth from bottom to top by the rotations of the mandibular outer first rotation shaft and the mandibular outer second rotation shaft.
 12. The mouthpiece type toothbrush according to claim 2, wherein: a liquid toothpaste tube is disposed inside the maxillary outer first rotation shaft, the maxillary outer second rotation shaft, the maxillary inner first rotation shaft, the maxillary inner second rotation shaft, the mandibular outer first rotation shaft, the mandibular outer second rotation shaft, the mandibular inner first rotation shaft, and the mandibular inner second rotation shaft; and the toothpaste in the liquid toothpaste tube is dispensed through a plurality of holes disposed at the maxillary outer first rotation shaft, the maxillary outer second rotation shaft, the maxillary inner first rotation shaft, the maxillary inner second rotation shaft, the mandibular outer first rotation shaft, the mandibular outer second rotation shaft, the mandibular inner first rotation shaft, and the mandibular inner second rotation shaft by the rotations of the maxillary outer first rotation shaft, the maxillary outer second rotation shaft, the maxillary inner first rotation shaft, the maxillary inner second rotation shaft, the mandibular outer first rotation shaft, the mandibular outer second rotation shaft, the mandibular inner first rotation shaft, and the mandibular inner second rotation shaft.
 13. An operating method of a mouthpiece type toothbrush, the operating method comprising: moving a maxillary body part and a mandibular body part in the direction of touching each other; rotating and moving a maxillary one-way bearing disposed at the maxillary body part and a mandibular one-way bearing disposed at the mandibular body part in the direction of becoming closer to each other along a shaft part; rotating a maxillary outer first rotation shaft and a maxillary outer second rotation shaft in the direction of brushing upper teeth from top to bottom by the rotation of the maxillary one-way bearing; and rotating a mandibular outer first rotation shaft and a mandibular outer second rotation shaft in the direction of brushing lower teeth from bottom to top by the rotation of the mandibular one-way bearing.
 14. The operating method according to claim 13, further comprising, after the rotating of the maxillary outer first rotation shaft and the maxillary outer second rotation shaft in the direction of brushing upper teeth from top to bottom by the rotation of the maxillary one-way bearing: rotating a maxillary inner first rotation shaft in the direction of brushing upper teeth from top to bottom by the rotation of the maxillary outer first rotation shaft; and rotating a maxillary inner second rotation shaft in the direction of brushing upper teeth from top to bottom by the rotation of the maxillary outer second rotation shaft.
 15. The operating method according to claim 13, further comprising, after the rotating of the mandibular outer first rotation shaft and the mandibular outer second rotation shaft in the direction of brushing lower teeth from bottom to top by the rotation of the mandibular one-way bearing: rotating a mandibular inner first rotation shaft in the direction of brushing lower teeth from bottom to top by the rotation of the mandibular outer first rotation shaft; and rotating a mandibular inner second rotation shaft in the direction of brushing lower teeth from bottom to top by the rotation of the mandibular outer second rotation shaft.
 16. The operating method according to claim 13, further comprising, after the rotating of the mandibular outer first rotation shaft and the mandibular outer second rotation shaft in the direction of brushing lower teeth from bottom to top by the rotation of the mandibular one-way bearing: spacing the maxillary body part and the mandibular body part apart in the direction of becoming farther from each other; and moving, while not rotating, the maxillary one-way bearing disposed at the maxillary body part and the mandibular one-way bearing disposed at the mandibular body part in the direction of becoming farther from each other along the shaft part.
 17. A mouthpiece type toothbrush comprising: a maxillary body part; a maxillary groove part formed at the maxillary body part to accommodate upper teeth; a maxillary outer rotation shaft configured with a plurality of straight shafts along an outside inner wall of the maxillary groove part; a maxillary inner rotation shaft configured with a plurality of straight shafts along an inside inner wall of the maxillary groove part; a maxillary third gear formed on any one straight shaft among the plurality of straight shafts configuring the maxillary outer rotation shaft; a shaft part having a screw thread; and a maxillary one-way bearing configured to rotate in one direction by a movement of the screw thread of the shaft part, wherein the maxillary third gear rotates together with the rotation of the maxillary one-way bearing.
 18. The mouthpiece type toothbrush according to claim 17, further comprising a belt member configured to connect the maxillary outer rotation shaft and the maxillary inner rotation shaft, wherein: the plurality of straight shafts configuring the maxillary outer rotation shaft are connected via an axial gear on which a screw gear is formed; and the plurality of straight shafts configuring the maxillary inner rotation shaft are connected via an axial gear on which a screw gear is formed.
 19. The mouthpiece type toothbrush according to claim 17, further comprising a maxillary first gear and a maxillary second gear, wherein the rotation of the maxillary third gear together with the rotation of the maxillary one-way bearing is performed by: the maxillary first gear rotating by the rotation of the maxillary one-way bearing; the maxillary second gear rotating by the rotation of the maxillary first gear; and the maxillary third gear rotating by the rotation of the maxillary second gear.
 20. The mouthpiece type toothbrush according to claim 17, further comprising: a mandibular body part; a mandibular groove part formed at the mandibular body part to accommodate lower teeth; a mandibular outer rotation shaft configured with a plurality of straight shafts along an outside inner wall of the mandibular groove part; a mandibular inner rotation shaft configured with a plurality of straight shafts along an inside inner wall of the mandibular groove part; a mandibular third gear formed on any one straight shaft among the plurality of straight shafts configuring the mandibular outer rotation shaft; a shaft part having a screw thread; a mandibular one-way bearing configured to rotate in one direction by a movement of the screw thread of the shaft part; a belt member configured to connect the mandibular outer rotation shaft and the mandibular inner rotation shaft; a mandibular first gear; and a mandibular second gear, wherein: the mandibular third gear rotates together with the rotation of the mandibular one-way bearing; the plurality of straight shafts configuring the mandibular outer rotation shaft are connected via an axial gear on which a screw gear is formed; the plurality of straight shafts configuring the mandibular inner rotation shaft are connected via an axial gear on which a screw gear is formed; and the rotation of the mandibular third gear together with the rotation of the mandibular one-way bearing is performed by the mandibular first gear rotating by the rotation of the mandibular one-way bearing, the mandibular second gear rotating by the rotation of the mandibular first gear, and the mandibular third gear rotating by the rotation of the mandibular second gear. 